1. The problem statement, all variables and given/known data There are no numbers given, just a question of relation. A box with mass m rest on a board. One side of the board lifts up until the box begins to slide. For this to happen, the angle theta that the board makes with the horizontal floor depends on: m a (g) N mu 2. Relevant equations Fnet = -muN + mg 3. The attempt at a solution I tried solving it in terms of the x component of W=mg. So F=mg-f (f = muN or friction) F=Wx - f Wx=mg(sin theta) Wx-muN=Wx-muWx Wx(1-mu) 0=mg(sin theta)(1-mu) Those were my best attempts to come up with some sort of equation for this.